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late registration conflict

I'm 21 yrs old and in all of my IDs ( sss, pag-ibig, tin, philhealth etc....) and documents ( academics) Ive been using my stepfather's surname but it turns out po na in my birth certificate my surname is under my biological father.

These are what I do know- my bio-father and mother weren't married.- I was really registered under my biological father's surname- my stepfather and mother get married and my stepfather wants us ( me and my brother) to use his surname kaya nagpa late registration po sila ng birth certificate namin under na po his surname which is lumabas naman po sa NSO before (i think around 2009 nung kumuha kami) pero last week kumuha kami ulit hindi na po ma trace ang pina late registration at ang lumalabas ay yung sa biological father ko.

My concern is, is it best if I just make all my documents be changed into my biological father's or if I changed my birth certificate into my stepfather's? And what are the step to do so?

I've never seen my bio-father ever since he and my mother part ways po. Mas magiging madali po ba ang process if I just change all of my credentials to my bio-fathers's rather if I change my birth certificate into my stepfather's?

Dagdag ko lang po. Baka makatulong.In general, the government as I understand it honors the 1st NSO certified BC.A petition has to be filed in court to cancel the other one.Filing is done in the munisipyo or city where you were born.This requires a representation from a lawyer.You may ask for further info from the office of the civil registrar where you are registered.